Not at all. They don't need to sell the licensed goods in four days - they need to sell the license to licensees earlier in the quarter. The D&D BRAND then becomes more successful for the quarter. The licensees are the ones who need to worry about whether or not their merchandise actually sells to people without WotC having to worry about it. As far as I understand it (and I admit, I don't know a lot about licensed merchandise beyond selling it for thirty years) that's why a company would want to license their brands.
Also, your tweet doesn't say anything at all about how D&D books have been selling, so I don't know how it's the "opposite" to what I suggested. I sell D&D books for a living (among other things) and while the current ones are still selling well, they're not selling anywhere near as many as previous offerings. I can't imagine how my experience in this wouldn't also be true across the board.